如何用Swift和Objective-C创建XML文件？

import Foundation

let xmlParser = XMLParser(data: Data())
xmlParser.delegate = self

extension ViewController: XMLParserDelegate {
    func parserDidStartDocument(_ parser: XMLParser) {
        // 开始文档
    }
    
    func parserDidEndDocument(_ parser: XMLParser) {
        // 结束文档
    }
    
    func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {
        // 开始元素
    }
    
    func parser(_ parser: XMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
        // 结束元素
    }
}

func parser(_ parser: XMLParser, foundCharacters string: String) {
    // 处理元素内容
}

xmlParser.parse()

#import <Foundation/Foundation.h>

NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:[NSData data]];
xmlParser.delegate = self;

@interface ViewController () <NSXMLParserDelegate>

@end

@implementation ViewController

- (void)parserDidStartDocument:(NSXMLParser *)parser {
    // 开始文档
}

- (void)parserDidEndDocument:(NSXMLParser *)parser {
    // 结束文档
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict {
    // 开始元素
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
    // 结束元素
}

@end

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
    // 处理元素内容
}

[xmlParser parse];